the taliban have claimed responsibility. >> the incident has again raised questions about afghan forces assuming responsibility for security by the end of next year. >> the latest round of talks over iran's disputed nuclear program have drawn to a close. >> while there was a breakthrough in negotiations it has extent, tehran says a turning point has been reached. world powers say they will ease sanctions on iran if the country will accept limitations on in richmond. iran has rejected fears that material process there could be used to make nuclear weapons. the sides have agreed to meet again in april. coming up after a short break, we will have more coverage of the pope's farewell to the catholic church. >> plus, the latest in german soccer. stay tuned. >> welcome back. germany, in the shape of martin luther, provided spark for the protestant revolution. >> there were hopes that benedict xvi would finally foster more unity. >> but there was disappointment as papacy saw no significant to melt -- developments. >> it was a moment of hope for many catholics and protestants. after centuries o